What is tar sand, or oil sand, and how is it extracted and converted to heavy oil? what are some environmental problems related to the use of this energy resource? what is shale oil and how is it produced? what are the major advantages and disadvantages of using heavy oils produced from tar sand and shale oil as energy resources?

Match the vocabulary word with its meaning

Imagine you work as a consultant, and your daily job involves listening to the constructive criticism of others. as part of your job, you must listen to opposing viewpoints to make important decisions. in this activity, you are a consulting dam engineer. you must make a decision about four different dams; should they be repaired, taken down, or left alone? you will listen to contrasting opinions about what should be done with the dams before you make the final decision. as the consulting dam engineer, what do you decide to do with this dam? explain your reasoning. by making your decision, did you support the opinions of the mayor and/or the dam safety official? why or why not? (site 1)

Based on current rates the earths human population is expected to grow how much by 2050